1 ## Copyright (C) 2012 Rik Wehbring
2 ## Copyright (C) 1995-2012 Kurt Hornik
4 ## This file is part of Octave.
6 ## Octave is free software; you can redistribute it and/or modify it
7 ## under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 3 of the License, or (at
9 ## your option) any later version.
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 ## General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with Octave; see the file COPYING. If not, see
18 ## <http://www.gnu.org/licenses/>.
21 ## @deftypefn {Function File} {} stdnormal_rnd (@var{r})
22 ## @deftypefnx {Function File} {} stdnormal_rnd (@var{r}, @var{c}, @dots{})
23 ## @deftypefnx {Function File} {} stdnormal_rnd ([@var{sz}])
24 ## Return a matrix of random samples from the standard normal distribution
25 ## (mean = 0, standard deviation = 1).
27 ## When called with a single size argument, return a square matrix with
28 ## the dimension specified. When called with more than one scalar argument the
29 ## first two arguments are taken as the number of rows and columns and any
30 ## further arguments specify additional matrix dimensions. The size may also
31 ## be specified with a vector of dimensions @var{sz}.
34 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
35 ## Description: Random deviates from the standard normal distribution
37 function rnd = stdnormal_rnd (varargin)
44 if (isscalar (varargin{1}) && varargin{1} >= 0)
45 sz = [varargin{1}, varargin{1}];
46 elseif (isrow (varargin{1}) && all (varargin{1} >= 0))
49 error ("stdnormal_rnd: dimension vector must be row vector of non-negative integers");
52 if (any (cellfun (@(x) (!isscalar (x) || x < 0), varargin)))
53 error ("stdnormal_rnd: dimensions must be non-negative integers");
63 %!assert(size (stdnormal_rnd (3)), [3, 3]);
64 %!assert(size (stdnormal_rnd ([4 1])), [4, 1]);
65 %!assert(size (stdnormal_rnd (4,1)), [4, 1]);
67 %% Test input validation
68 %!error stdnormal_rnd ()
69 %!error stdnormal_rnd (-1)
70 %!error stdnormal_rnd (ones(2))
71 %!error stdnormal_rnd ([2 -1 2])
72 %!error stdnormal_rnd (1, ones(2))
73 %!error stdnormal_rnd (1, -1)